Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas

Kobayashi, T.; Ida, K.; Inagaki, S.; Tsuchiya, H.; Tamura, N.; Choe, G. H.; Yun, G. S.; Park, H. K.; Ko, W. H.; Evans, T. E.; Austin, M. E.; Shafer, M. W.; Ono, M.; López-bruna, D.; Ochando, M. A.; Estrada, T.; Hidalgo, C.; Moon, C.; Igami, H.; Yoshimura, Y.; Tsujimura, T. Ii.; Itoh, S. -I.; Itoh, K.

doi:10.1088/1741-4326/aa6f1f

Title: Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas

Abstract

In this contribution we analyze modulation electron cyclotron resonance heating (MECH) experiment and discuss higher harmonic frequency dependence of transport coefficients. We use the bidirectional heat pulse propagation method, in which both inward propagating heat pulse and outward propagating heat pulse are analyzed at a radial range, in order to distinguish frequency dependence of transport coefficients due to hysteresis from that due to other reasons, such as radially dependent transport coefficients, a finite damping term, or boundary effects. The method is applied to MECH experiments performed in various helical and tokamak devices, i.e. Large Helical Device (LHD), TJ-II, Korea Superconducting Tokamak Advanced Research (KSTAR), and Doublet III-D (DIII-D) with different plasma conditions. Here, the frequency dependence of transport coefficients are clearly observed, showing a possibility of existence of transport hysteresis in flux-gradient relation.

Authors:

Kobayashi, T. ^[1]; Ida, K. ^[2]; Inagaki, S. ^[3]; Tsuchiya, H. ^[4]; Tamura, N. ^[4]; Choe, G. H. ^[5]; Yun, G. S. ^[5]; Park, H. K. ^[6]; Ko, W. H. ^[7]; Evans, T. E. ^[8]; Austin, M. E. ^[9]; Shafer, M. W. ^[10]; Ono, M. ^[11]; López-bruna, D. ^[12]; Ochando, M. A. ^[12]; Estrada, T. ^[12]; Hidalgo, C. ^[12]; Moon, C. ^[13]; Igami, H. ^[4]; Yoshimura, Y. ^[4] more »

National Inst. for Fusion Science (NIFS), Toki (Japan). National Inst. of Natural Sciences; The Graduate Univ. for Advanced Studies (SOKENDAI), Toki (Japan)
National Inst. for Fusion Science (NIFS), Toki (Japan). National Inst. of Natural Sciences; The Graduate Univ. for Advanced Studies (SOKENDAI), Toki (Japan); Kyushu Univ. (Japan). Research Center for Plasma Turbulence
Kyushu Univ. (Japan). Research Center for Plasma Turbulence; Kyushu Univ. (Japan). Research Inst. for Applied Mechanics
National Inst. for Fusion Science (NIFS), Toki (Japan). National Inst. of Natural Sciences
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
National Fusion Research Inst., Daejeon (Korea); Ulsan National Inst. of Science and Technology, Ulsan (Korea)
National Fusion Research Inst., Daejeon (Korea)
General Atomics, San Diego, CA (United States)
Univ. of Texas, Austin, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
The Graduate Univ. for Advanced Studies (SOKENDAI), Toki (Japan)
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain). Lab. Nacional de Fusión
Max-Planck-Inst. für Plasmaphysik, Garching (Germany)
National Inst. for Fusion Science (NIFS), Toki (Japan). National Inst. of Natural Sciences; Kyushu Univ. (Japan). Research Center for Plasma Turbulence

Publication Date:: Wed May 17 00:00:00 EDT 2017

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1468009

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Fusion

Additional Journal Information:: Journal Volume: 57; Journal Issue: 7; Journal ID: ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; heat transport; heat pulse propagation; modulation ECH

Citation Formats


                    Kobayashi, T., Ida, K., Inagaki, S., Tsuchiya, H., Tamura, N., Choe, G. H., Yun, G. S., Park, H. K., Ko, W. H., Evans, T. E., Austin, M. E., Shafer, M. W., Ono, M., López-bruna, D., Ochando, M. A., Estrada, T., Hidalgo, C., Moon, C., Igami, H., Yoshimura, Y., Tsujimura, T. Ii., Itoh, S. -I., and Itoh, K. Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas.  United States: N. p., 2017. 
Web.  doi:10.1088/1741-4326/aa6f1f.

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                    Kobayashi, T., Ida, K., Inagaki, S., Tsuchiya, H., Tamura, N., Choe, G. H., Yun, G. S., Park, H. K., Ko, W. H., Evans, T. E., Austin, M. E., Shafer, M. W., Ono, M., López-bruna, D., Ochando, M. A., Estrada, T., Hidalgo, C., Moon, C., Igami, H., Yoshimura, Y., Tsujimura, T. Ii., Itoh, S. -I., & Itoh, K. Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas.  United States.  https://doi.org/10.1088/1741-4326/aa6f1f

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                    Kobayashi, T., Ida, K., Inagaki, S., Tsuchiya, H., Tamura, N., Choe, G. H., Yun, G. S., Park, H. K., Ko, W. H., Evans, T. E., Austin, M. E., Shafer, M. W., Ono, M., López-bruna, D., Ochando, M. A., Estrada, T., Hidalgo, C., Moon, C., Igami, H., Yoshimura, Y., Tsujimura, T. Ii., Itoh, S. -I., and Itoh, K. Wed .  
"Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas".  United States.  https://doi.org/10.1088/1741-4326/aa6f1f.  https://www.osti.gov/servlets/purl/1468009.

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@article{osti_1468009,

  title        = {Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas},

  author       = {Kobayashi, T. and Ida, K. and Inagaki, S. and Tsuchiya, H. and Tamura, N. and Choe, G. H. and Yun, G. S. and Park, H. K. and Ko, W. H. and Evans, T. E. and Austin, M. E. and Shafer, M. W. and Ono, M. and López-bruna, D. and Ochando, M. A. and Estrada, T. and Hidalgo, C. and Moon, C. and Igami, H. and Yoshimura, Y. and Tsujimura, T. Ii. and Itoh, S. -I. and Itoh, K.},

  abstractNote = {In this contribution we analyze modulation electron cyclotron resonance heating (MECH) experiment and discuss higher harmonic frequency dependence of transport coefficients. We use the bidirectional heat pulse propagation method, in which both inward propagating heat pulse and outward propagating heat pulse are analyzed at a radial range, in order to distinguish frequency dependence of transport coefficients due to hysteresis from that due to other reasons, such as radially dependent transport coefficients, a finite damping term, or boundary effects. The method is applied to MECH experiments performed in various helical and tokamak devices, i.e. Large Helical Device (LHD), TJ-II, Korea Superconducting Tokamak Advanced Research (KSTAR), and Doublet III-D (DIII-D) with different plasma conditions. Here, the frequency dependence of transport coefficients are clearly observed, showing a possibility of existence of transport hysteresis in flux-gradient relation.},

  doi          = {10.1088/1741-4326/aa6f1f},

  journal      = {Nuclear Fusion},

  number       = 7,

  volume       = 57,

  place        = {United States},

  year         = {Wed May 17 00:00:00 EDT 2017},

  month        = {Wed May 17 00:00:00 EDT 2017}

}

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Works referenced in this record:

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Title: Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas

Abstract

Citation Formats

Electron heat transport in ASDEX Upgrade: experiment and modelling journal, November 2003

Electron profile stiffness and critical gradient studies journal, August 2012

Inward energy transport in tokamak plasmas journal, January 1992

Heat Convection and Transport Barriers in Low-Magnetic-Shear Rijnhuizen Tokamak Project Plasmas journal, November 2000

Investigation of electron heat pinch in ASDEX-Upgrade journal, January 2006

Ballistic contributions to heat-pulse propagation in the TFTR tokamak journal, December 1990

Transient electron heat diffusivity obtained from trace impurity injection on TFTR journal, March 1994

Strong Nonlocal Effects in a Tokamak Perturbative Transport Experiment journal, May 1995

Electron energy transport inferences from modulated electron cyclotron heating in DIII-D journal, January 2006

How is turbulence intensity determined by macroscopic variables in a toroidal plasma? journal, September 2013

Fast transport changes and power degradation in the W7-AS stellarator journal, April 1996

Electron thermal conductivity from heat wave propagation in Wendelstein 7-AS journal, November 1992

Higher Harmonics in a Perturbative Transport Experiment journal, January 2013

Higher Harmonics in the Perturbative Transport Study in TJ-II ECH Plasma journal, January 2014

Perturbative transport studies in fusion plasmas journal, August 1995

On the Study of Higher Harmonics of Heat Pulse Propagation in the Modulated-Heating Experiments journal, January 2016

Energy confinement scaling from the international stellarator database journal, August 1996

Scalings for tokamak energy confinement journal, October 1990

Electron heat transport in ASDEX Upgrade: experiment and modelling
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